Drum type washing machine

Abstract

In one aspect, a drum type washing machine includes, among other things, a tub supporter of metal between a wall of a tub and a stator, where the stator includes an annular helical type core having multiple layers formed by winding a steel plate having Ts and a base portion in a helix starting from a bottom layer to a top layer, an insulator insert molded with the helical type core to cover an outside surface of the helical type core for electrical insulation of the helical type core, and three fastening portions formed, as a unit with the insulator projected from an inside circumferential surface of the helical type core toward a center of the stator, for fastening the stator to the tub supporter, wherein the fastening portion has a fastening hole at a center for fastening the stator to the wall of the tub with screws.

1. A drum type washing machine comprising:
 a tub of plastic for holding washing water, the tub having a wall for mounting a driving unit thereto; 
 a drum mounted on an inside of the tub; 
 a shaft passed through the tub and coupled to the drum mounted inside of the tub, for transmission of driving force from a motor to the drum; 
 at least one bearing for supporting the shaft; 
 a bearing housing insert molded in the plastic tub for supporting the bearing; 
 a stator to form the motor with a rotor; 
 the rotor around the stator; and 
 a tub supporter of metal between the wall of the tub and the stator, 
 wherein the stator includes; 
 an annular helical type core having multiple layers formed by winding a steel plate having Ts and a base portion in a helix starting from a bottom layer to a top layer, 
 an insulator insert molded with the helical type core to cover an outside surface of the helical type core for electrical insulation of the helical type core, and 
 three fastening portions formed as a unit with the insulator projected from an inside circumferential surface of the helical type core toward a center of the stator, for fastening the stator to the tub supporter, wherein the fastening portion has a fastening hole at a center for fastening the stator to the wall of the tub with screws. 
 
   
   
     2. The drum type washing machine as claimed in  claim 1 , wherein the insulator of the stator includes positioning projections, or holes, and the tub supporter includes holes, or projections in complementary to the positioning projections, or holes of the insulator. 
   
   
     3. The drum type washing machine as claimed in  claim 1 , wherein the tub supporter includes fastening holes in correspondence to fastening holes in the insulator of the stator. 
   
   
     4. The drum type washing machine as claimed in  claim 1 , further comprising a cylindrical metal for inserting in the fastening hole at the center of the fastening portion. 
   
   
     5. The drum type washing machine as claimed in  claim 1 , wherein the fastening portion has a height 20% or more of a total height of the core. 
   
   
     6. The drum type washing machine as claimed in  claim 1 , wherein the fastening portion has a height in a range of 20%˜150% of a total height of the core. 
   
   
     7. The drum type washing machine as claimed in  claim 1 , wherein there are at least three the fastening portions. 
   
   
     8. The drum type washing machine as claimed in  claim 1 , wherein the fastening portion is formed such that a≧b where “a” denotes a length of the T projected from an outside circumferential surface of the helical type core, and “b” denotes a distance from the inside surface of the helical type core to a center of the fastening hole in the fastening portion. 
   
   
     9. The drum type washing machine as claimed in  claim 1 , wherein the fastening portion on the stator includes a hollow pin for damping vibration when the motor is driven. 
   
   
     10. The drum type washing machine as claimed in  claim 1 , wherein the multiple layers of the helical type core are held together with rivets passed through pass through holes in the base portion. 
   
   
     11. The drum type washing machine as claimed in  claim 1 , wherein the bottom layer, and the top layer, which are the winding starting portion and the winding end portion of the helical type core, are welded to a base portion, respectively. 
   
   
     12. The drum type washing machine as claimed in  claim 1 , wherein the stator has weight of 1.5 kg or more. 
   
   
     13. A drum type washing machine comprising:
 a tub of plastic for holding washing water, the tub having a wall for mounting a driving unit thereto; 
 a drum mounted on an inside of the tub; 
 a shaft passed through the tub and coupled to the drum mounted inside of the tub, for transmission of driving force from a motor to the drum; 
 at least one bearing for supporting the shaft; 
 a bearing housing insert molded in the plastic tub for supporting the bearing; 
 a stator to form the motor with a rotor; 
 the rotor around the stator; and 
 a metal tub supporter between a wall of the tub and the stator, 
 wherein the stator includes; 
 an annular helical type core having multiple layers formed by winding a steel plate having Ts and a base portion in a helix starting from a bottom layer to a top layer, 
 an insulator to cover an outside surface of the helical type core for insulating the helical type core electrically, and 
 fastening portions formed as a unit with the insulator projected from an inside circumferential surface of the helical type core toward a center of the stator, for fastening the stator to the tub, wherein the fastening portion has a fastening hole at a center for fastening the stator to the wall of the tub with screws. 
 
   
   
     14. The drum type washing machine as claimed in  claim 13 , wherein the stator has a weight of 1.5 kg or more. 
   
   
     15. The drum type washing machine as claimed in  claim 13 , wherein the insulator of the stator includes positioning projections, or holes, and the tub supporter includes holes, or projections in complementary to the positioning projections, or holes of the insulator. 
   
   
     16. The drum type washing machine as claimed in  claim 13 , wherein the tub supporter includes fastening holes in correspondence to fastening holes in the insulator of the stator. 
   
   
     17. The drum type washing machine as claimed in  claim 13 , further comprising a cylindrical metal inserted in the fastening hole at the center of the fastening portion. 
   
   
     18. The drum type washing machine as claimed in  claim 13 , wherein the fastening portion has a height 20% or more of a total height of the core. 
   
   
     19. The drum type washing machine as claimed in  claim 13 , wherein there are at least three fastening portions spaced from one another and projected toward a center of the stator.